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Texas Instruments LP3856ESX-3.3/NOPB
- Part No.:
- LP3856ESX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3856ESX-3.3/NOPB.pdf
- Description:
- IC REG LIN 3.3V 3A DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:389
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Product details
Overview
LP3856ESX-3.3/NOPB from Texas Instruments is a 3A ultra-low-dropout linear regulator delivering a fixed 3.3V ±10% output from 2.5V–7.0V input, featuring 390mV dropout at 3A, 0.08% load regulation, and remote sense capability for precision remote-load regulation in microprocessor power supplies.
For engineers reviewing the LP3856ESX-3.3/NOPB datasheet, LP3856ESX-3.3/NOPB pinout, LP3856ESX-3.3/NOPB application, or LP3856ESX-3.3/NOPB equivalent, key selection considerations include dropout voltage under full load, ground pin current vs. load, ceramic capacitor stability requirements, shutdown quiescent current (10nA), and SENSE pin implementation for remote load accuracy.
Technical Context
The LP3856ESX-3.3/NOPB uses a PMOS pass element on a CMOS process to achieve low quiescent current independent of load, enabling stable operation down to 39mV dropout at light loads and maintaining regulation under fast load transients. Its error flag comparator monitors VOUT with 10% threshold hysteresis and open-drain output.
Unlike the LP3853 variant, the LP3856ESX-3.3/NOPB substitutes the ERROR pin with a SENSE pin (Pin 5) to enable Kelvin-sense feedback for improved load regulation at remote points-critical for high-current digital loads where PCB trace resistance degrades local output accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% at 25°C; ±3.0% over full temperature/load/line range-ensures reliable logic-level compliance for 3.3V I/O domains. |
| Max Output Current | 3A DC continuous-supports high-current FPGA core rails, DSPs, and ASIC power domains without external current boosting. |
| Dropout Voltage | 390mV at 3A load-enables operation from 3.69V input when powering 3.3V loads, minimizing thermal stress and input supply headroom. |
| Ground Pin Current | 4mA typical at 3A-low bias current preserves efficiency in battery-powered systems and reduces heat generation in compact layouts. |
| PSRR @ 120Hz | 57dB at VIN = VOUT + 0.5V-suppresses ripple from upstream switching regulators, critical for noise-sensitive analog subsystems. |
| Shutdown IQ | 10nA typical-allows deep power-down in portable devices without compromising system wake-up latency or battery shelf life. |
| Load Regulation | 0.08%-translates to ±2.64mV variation across 0–3A load, supporting tight-tolerance applications like DDR memory termination. |
| Operating Temp | −40°C to +125°C junction-qualified for industrial and automotive under-hood environments without derating penalties. |
Pinout & Package
LP3856ESX-3.3/NOPB is packaged in TO-263-5 (D²Pak), surface-mount, thermally enhanced plastic package with exposed thermal pad. Pin 1 (SD) enables logic-controlled shutdown; Pin 5 (SENSE) provides remote voltage sensing for improved regulation at point-of-load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Shutdown Control Input | CMOS-compatible active-low enable; requires 10kΩ pull-up to VIN for normal operation; asserts shutdown below 0.3V. |
| 2 - VIN | Main Input Supply | Accepts 2.5V–7.0V; must be decoupled with ≥10µF ceramic or tantalum capacitor placed within 1 cm of pin. |
| 3 - GND | Power Ground Reference | Single-point Kelvin connection required for stability; ties internal circuitry and thermal pad to system ground plane. |
| 4 - VOUT | Regulated Output Terminal | Delivers 3.3V; connects directly to output capacitor and load; not used for regulation when SENSE is active. |
| 5 - SENSE | Remote Sense Input | Connects to load-side of PCB trace to compensate for IR drop; must be tied to VOUT if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Dropout | 390mV at 3A enables use with minimal input–output differential-reducing heat dissipation and extending battery runtime. |
| Ceramic Capacitor Stability | Stable with ≥10µF ceramic output capacitors when input capacitance is matched per TI Figure 29-eliminates bulkier tantalum parts and improves high-frequency bypassing. |
| Remote Sense Accuracy | SENSE pin reduces effective load regulation error by compensating for PCB trace resistance-maintains ±1.5% accuracy at point-of-load even with 100mΩ trace impedance. |
| Integrated Protection | Thermal shutdown, overcurrent limiting, and short-circuit foldback prevent damage during fault conditions-no external protection circuitry required. |
| Low-Noise Operation | 150µVRMS output noise (BW = 10Hz–100kHz) supports noise-sensitive analog circuits like ADC references and RF bias rails. |
Applications
| Microprocessor Core Power | GTL/GTL+ Bus Termination |
|---|---|
Use Scenario: Powers 3.3V I/O domains of FPGAs and microcontrollers requiring fast transient response and tight voltage tolerance. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise 3.3V rail with SENSE pin correcting for PCB trace IR drop. Use Value: Maintains 3.3V ±1.5% at load despite 100mΩ interconnect resistance-prevents signal integrity degradation and timing margin loss. | Use Scenario: Supplies termination voltage for GTL/GTL+ signaling buses in high-speed backplanes and server motherboards. IC Role / Device Role / Timing Role: Precision 3.3V reference source with low output impedance and fast load step recovery. Use Value: 0.08% load regulation ensures consistent bus voltage across varying drive strength-minimizing skew and reflection-induced jitter. |
| SCSI Terminator | Battery-Powered DSP Systems |
Use Scenario: Provides regulated termination voltage for legacy SCSI-2/3 parallel interfaces in storage controllers. IC Role / Device Role / Timing Role: Low-noise, high-accuracy 3.3V source with shutdown control for hot-swap isolation. Use Value: 10nA shutdown current extends battery life during idle periods; 57dB PSRR rejects switching noise from shared DC/DC converters. | Use Scenario: Powers low-power DSPs in portable medical or test equipment operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Efficient linear regulator bridging 3.6–4.2V battery range to stable 3.3V DSP core voltage. Use Value: 390mV dropout allows >90% usable battery capacity before brownout; 4mA ground current minimizes quiescent drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP3853ESX-3.3/NOPB | Same package and output voltage but replaces SENSE with ERROR flag; no remote sensing capability. | Suitable for local-regulation-only designs where output and load share same node; lacks trace-drop compensation. | Select LP3853ESX-3.3/NOPB only when error monitoring is prioritized over remote load accuracy. |
| TLS850F33TAV50 | Automotive-grade 3.3V LDO with integrated watchdog and reset logic; higher 500mV dropout at 3A; AEC-Q100 qualified. | Designed for automotive infotainment and ADAS ECUs requiring functional safety features-not drop-in for industrial/commercial use. | Choose TLS850F33TAV50 only for ASIL-B compliant systems needing built-in diagnostics and extended temperature support. |
Compared with LP3853ESX-3.3/NOPB, the LP3856ESX-3.3/NOPB trades error-flag functionality for remote sense capability-making it superior for distributed power architectures. Versus TLS850F33TAV50, it offers lower dropout and simpler integration but lacks automotive qualification and safety features.
Availability
LP3856ESX-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor power supplies, GTL bus terminators, SCSI interface modules, and battery-powered DSP systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.
Supply support for LP3856ESX-3.3/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability linear regulation and low-noise power solutions.
The LP3856 series belongs to TI's ultra-low-dropout LDO portfolio, engineered specifically for high-current, low-voltage digital systems where remote load regulation, ceramic capacitor compatibility, and minimal thermal footprint are critical design constraints.
FAQ
What is the minimum input voltage required for LP3856ESX-3.3/NOPB to regulate 3.3V output?
The LP3856ESX-3.3/NOPB requires a minimum input voltage equal to VOUT + dropout voltage. At 3A load, dropout is 390mV, so minimum VIN is 3.69V. At lighter loads, dropout drops to 39mV (3.339V min). The absolute minimum VIN is 2.5V per spec, but operation below VOUT + dropout results in unregulated output. Always verify actual dropout using the load-current–dropout curve in the datasheet.
Can LP3856ESX-3.3/NOPB operate stably with only ceramic capacitors?
Yes, LP3856ESX-3.3/NOPB is explicitly characterized for stability with ceramic output capacitors. Stable operation requires matching input and output ceramic capacitance per TI Figure 29: e.g., 10µF ceramic CIN supports up to ~50µF ceramic COUT at 3A load. X7R/X5R dielectrics are recommended to maintain capacitance across voltage and temperature. Avoid Z5U/Y5V due to severe voltage coefficient.
How should the SENSE pin be connected on LP3856ESX-3.3/NOPB?
The SENSE pin (Pin 5) must be connected directly to the load-side of the output trace-ideally at the load's power input pad-to compensate for IR drop. If remote sensing is unused, tie SENSE directly to VOUT (Pin 4) with a short, low-inductance trace. Never leave SENSE floating, as this causes regulation instability and potential overvoltage at the load.
What is the purpose of the 10kΩ pull-up resistor on the SD pin of LP3856ESX-3.3/NOPB?
The 10kΩ pull-up resistor on the SD pin ensures the LP3856ESX-3.3/NOPB remains enabled during power-up and normal operation. Without it, the CMOS input floats, risking undefined state and intermittent shutdown. Pulling SD high through 10kΩ to VIN guarantees reliable turn-on; pulling SD low (≤0.3V) forces 10nA shutdown mode. Do not omit this resistor in production designs.
Does LP3856ESX-3.3/NOPB include overtemperature protection?
Yes, LP3856ESX-3.3/NOPB integrates thermal shutdown protection that activates when junction temperature exceeds +125°C. Upon trip, the device cycles the PMOS pass element on/off to limit average power dissipation until temperature falls below the hysteresis threshold (~15°C below trip point). This prevents permanent damage during sustained overload or inadequate heatsinking.
LP3856ESX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 4 mA
- Current - Supply (Max):
- 10 mA
- PSRR:
- 73dB ~ 57dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LP3856ESX-3.3/NOPB FAQ
1.How can I place an order for LP3856ESX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3856ESX-3.3/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LP3856ESX-3.3/NOPB reliable?
The price and inventory of LP3856ESX-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3856ESX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP3856ESX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3856ESX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3856ESX-3.3/NOPB?
LP3856ESX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3856ESX-3.3/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LP3856ESX-3.3/NOPB?
For technical support, including LP3856ESX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3856ESX-3.3/NOPB requirements.
6.How does Aetrix verify that LP3856ESX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3856ESX-3.3/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP3856ESX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP3856ESX-3.3/NOPB?
All LP3856ESX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3856ESX-3.3/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LP3856ESX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP3856ESX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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